Add a new static library for mainline modules

Add a network static library for common utilities. This
library could be used by all mainline modules. Initially
create LinkPropertiesUtils and MacAddressUtils.

Bug: 139268426
Bug: 135998869
Bug: 138306002
Test: build lib pass
      atest NetworkStaticLibTests
Change-Id: I8f79e4f836819ac83007acffb55103e5d69873e0
diff --git a/staticlibs/tests/unit/Android.bp b/staticlibs/tests/unit/Android.bp
new file mode 100644
index 0000000..4a51a8c
--- /dev/null
+++ b/staticlibs/tests/unit/Android.bp
@@ -0,0 +1,18 @@
+//########################################################################
+// Build NetworkStaticLibTests package
+//########################################################################
+
+android_test {
+    name: "NetworkStaticLibTests",
+    certificate: "platform",
+    srcs: ["src/**/*.java","src/**/*.kt"],
+    test_suites: ["device-tests"],
+    static_libs: [
+        "androidx.test.rules",
+    ],
+    libs: [
+        "android.test.runner",
+        "android.test.base",
+    ],
+}
+